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提出半导体激光器混沌交叉相位调制(XPM)光反馈提高混沌载波发射机带宽方法,建立了有外腔光纤传输反馈XPM控制下的激光动力学物理模型.理论导出XPM作用下激光双反馈频率失谐公式,指出XPM产生的非线性相移影响了激光器增益和线宽增强因子,其光纤二阶非线性效应使激光振幅和相位变化更加丰富,而非线性相移的出现进一步增加了新的频率分量并使频谱展宽.数值结果表明,XPM使激光器混沌带宽增加到4倍以上,使激光混沌张弛振荡频率增加到2.85倍,其光纤长度、入纤光功率、面镜反射系数、光纤二阶非线性系数等都能影响激光混沌带宽.
The method of increasing the bandwidth of chaotic carrier transmitter by optical feedback of chaotic cross-phase modulation (XPM) of semiconductor laser is proposed, and a laser physics model of physics under the control of external fiber-optic feedback XPM is established. The theoretical deduced formula of laser double feedback frequency detuning , Pointed out that the non-linear phase shift produced by XPM affected the laser gain and linewidth enhancement factor, the second-order nonlinear effect of fiber made the laser amplitude and phase change more abundant, and the appearance of non-linear phase shift further increased the new frequency component The results show that XPM increases the chaotic bandwidth of the laser by more than four times and increases the chaotic relaxation oscillation frequency to 2.85 times. The fiber length, fiber power, mirror reflection coefficient, second order nonlinear coefficient Can affect the laser chaos bandwidth.